Details

Description

What I expected to happen was that a large amount of chicken would stay in a small shut off area.

What actually happened was the chicken started glitching trough the walls leaving only about 10 entities in the cage.

Steps to Reproduce:
1. Spawn a large amount of mobs (at least chicken) in a 1 block space
2. Make sure there's air around the cage.
3. Load the world in one of the newer snapshots and you'll find chicken spead around the cage.